Lilith doesn't really have a case, since Ucool didn't actually use the exact same art from them (which they took from DOTA/Blizzard anyway). The game concepts are pretty general and not original and lots of other games use the same concepts. Unless Lilith had successfully filed for a copyright on some sort of aspect of their game, such as the characters in the United States, they can't claim copyright infringement. They were not actually the first to enter the US market. I'm not sure what the IP laws are in the other countries, but at least in the US it would be really difficult for Lilith to make any case out of this.